The fingerprint sensor technology used in handheld biometric devices varies, influencing accuracy and performance. Optical sensors are common, capturing an image of the fingerprint. Capacitive sensors are more secure, detecting the unique patterns of ridges and valleys by measuring electrical capacitance. Some advanced devices might use ultrasonic sensors, which offer even higher secu... https://mobiworkforce.com.sg/products/handheld-biometric-fingerprint-attendance/